Module II: Ventilation Flashcards
Ventilation
Mechanical process by which ambient air is brought into and exchanged with air in the lungs
Respiration
Gas exchange that occurs in lungs (at alveolar/capillaries) and throughout the body (at target tissue/capillaries)
The mechanical process by which ambient air is brought into and exchanged with air in the lungs is ________.
Ventilation
Gas exchange that occurs in lungs (at alveolar/capillaries) and throughout the body (at target tissue/capillaries) is called _____________.
Respiration
Ventilation Rate
breaths per minute
~12/min at rest
Alveolar Ventilation
Volume of air that reaches the alveoli per minute
4.5 L/min
Dead Space Ventilation
Volume of air that DOES NOT reach the alveoli per minute
Minute Ventilation
volume of air inspired/expired per minute
6 L/min at rest
______ + ______ = minute ventilation
Alveolar ventilation
Dead Space Ventilation
What are the two respiratory centers in the brainstem?
Medulla
Pons
What is the action and function of the dorsal respiratory group in the medulla (DRG)?
Action: primarily inspiratory
Function: sets automatic rhythm of breathing
CO2 and O2 levels influence the rate of ventilation through which respiratory center?
DRG
Dorsal Respiratory Group in medulla
What kind of muscles would the DRG influence/control?
Inspiratory muscles:
- -> external intercostal muscles
- -> diaphragm
What is the action and function of the ventral respiratory group in the medulla (VRG)?
Action: both inspiratory and expiratory actions
Function:
- quiet during rest
- active when increased ventilation is required
Does the VRG control the internal intercostals or the external intercostals?
Internal intercostals